Wireless Charging Inverter Frequency Control
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Solution Overview
Problem
Current wireless power transfer systems for electric vehicles face inefficiencies in charging due to variations in charge voltage, which can lead to unstable energy transfer and reduced battery charging efficiency.
Innovation Solution
A system that includes an inverter configured to receive rectified mains line voltage and current, with a controller altering the switching frequency based on charge voltage data to drive the energy storage capacitor's voltage towards a constant value, ensuring efficient energy transfer between a primary coil and a secondary coil during wireless charging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If wireless power transfer is performed without frequency adjustment, then the system structure remains simple, but charge voltage varies causing unstable energy transfer and reduced charging efficiency
Solution Approach 1:
The inverter switching frequency is dynamically adjusted based on real-time charge voltage feedback from the vehicle battery. The controller modifies the switching frequency to maintain optimal charging conditions, transforming the static frequency system into a dynamic one that adapts to varying battery voltage levels, thereby resolving the contradiction between charging efficiency and system complexity
Solution Approach 2:
The system changes the electrical parameter (switching frequency) of the inverter based on battery charge voltage conditions. By varying the switching frequency parameter in response to voltage feedback, the system optimizes energy transfer efficiency without requiring fundamental structural changes, thus improving productivity while managing device complexity
2Reliability
If the inverter operates at fixed switching frequency, then the control system remains simple, but energy transfer stability deteriorates due to charge voltage variations
Solution Approach 1:
A feedback control mechanism is implemented where the controller receives charge voltage data from the vehicle battery and uses this information to adjust the inverter switching frequency. This closed-loop feedback system ensures stable energy transfer by continuously adapting to voltage variations, resolving the contradiction between reliability and control system complexity through intelligent control rather than hardware complexity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution stabilizes the energy transfer process, enhancing charging efficiency and consistency, thereby improving the overall performance of wireless charging for electric vehicles.
Implementation Method 1
an inverter configured to receive rectified mains line voltage and current to power a primary coil to induce charge current in a secondary coil of a vehicle
Implementation Method 2
a DC-AC inverter configured to receive a direct current input and generate an alternating current output having a variable frequency
Data Source
AI summary
A charging system includes an inverter configured to receive rectified mains line voltage and current to power a primary coil to induce charge current in a secondary coil of a vehicle. The charging system also includes a controller configured to alter a switching frequency of the inverter based on charge voltage data from the vehicle to cause the inverter to operate to drive a voltage of an energy storage capacitor of a battery charger of the vehicle toward a constant value.